the difference between 15 and the product of 5 and y5y-15 和 15-5y.哪个是对的,为什么?(一定要为什么!

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the difference between 15 and the product of 5 and y5y-15 和 15-5y.哪个是对的,为什么?(一定要为什么!
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the difference between 15 and the product of 5 and y5y-15 和 15-5y.哪个是对的,为什么?(一定要为什么!
the difference between 15 and the product of 5 and y
5y-15 和 15-5y.哪个是对的,为什么?(一定要为什么!

the difference between 15 and the product of 5 and y5y-15 和 15-5y.哪个是对的,为什么?(一定要为什么!
15- 5y is the right one.the difference between A and b means A-b
here the A means 15 and the B mean the product of 5 and y

15- 5y is the right one..... the difference between A and b means A-b
here the A means 15 and the B mean the product of 5 and y